It looks like you still have packages from an old PPA installed. Example:
libgtk2-unique-perl:amd64 < 0.05-3build1~0ppa1~disco @ii mK Ib > FU=0

Install ppa-purge and make sure you remove any PPA's.
sudo apt-get install ppa-purge

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https://bugs.launchpad.net/bugs/1893104

Title:
  no instal ubuntu 20.04

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